[all-commits] [llvm/llvm-project] 713c70: [VPlan] Handle regions with live-outs and scalar V...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 713c70d7ef50400e3533be05b4f08dc675dc012b
      https://github.com/llvm/llvm-project/commit/713c70d7ef50400e3533be05b4f08dc675dc012b
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-03-30 (Mon, 30 Mar 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
    M llvm/test/Transforms/LoopVectorize/VPlan/dissolve-replicate-regions.ll
    M llvm/test/Transforms/LoopVectorize/VPlan/interleave-and-scalarize-only.ll
    M llvm/test/Transforms/LoopVectorize/cast-induction.ll
    M llvm/test/Transforms/LoopVectorize/pr45679-fold-tail-by-masking.ll
    M llvm/test/Transforms/LoopVectorize/tail-folding-vectorization-factor-1.ll

  Log Message:
  -----------
  [VPlan] Handle regions with live-outs and scalar VF when replicating. (#186252)

Extend intial unrolling of replicate regions
(https://github.com/llvm/llvm-project/pull/170212) to support live-outs,
if the VF is scalar.

This allows adding the logic needed to explicitly unroll, and replacing
VPPredPhiInsts with regular scalar VPPhi, without yet having to worry
about packing values into vector phis. This will be done in a follow-up
change, which means all replicate regions will be fully dissolved.

PR: https://github.com/llvm/llvm-project/pull/186252



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